Snmp; Network Assessment - Avaya 4600 Series Administrator's Manual

Overview of Voice over IP (VoIP) and Network Protocols

SNMP

Simple Network Management Protocol (SNMP) is a family of standards-based protocols and
procedures to allow vendor-independent data network management. Using a simple set of
protocol commands, an SNMP-compliant device stores information in standard format in one or
more Management Information Bases (MIBs). Usually, devices support the standards-specific
MIB termed MIB-II. In addition, devices can define one or more "custom MIBs" that contain
information about the device's specifics.
As of Release 1.1, the 4600 Series IP Telephones are fully compatible with SNMPv2c, a later
version of SNMP, and with Structure of Management Information Version 2 (SMIv2). The
telephones respond correctly to queries from entities that comply with earlier versions of SNMP,
such as SNMPv1. "Fully compatible" means that the telephones respond to queries directed
either at the MIB-II or the Custom MIB. The 4600 Series IP Telephone Custom MIB is read-only.
Read-only means that the values therein cannot be changed externally by means of network
management tools.
You can restrict which IP Addresses the telephone accepts SNMP queries from. You can also
customize your community string with system values SNMPADD and SNMPSTRING,
respectively, as indicated in
Telephone Customizable System
!
Important:
SNMP has been enabled by default since Release 1.1. However, as of Release
Important:
2.6, the SNMP default changed to Null (Off). To activate SNMP, you must set
SNMPSTRING to a non-null value by means of either the 46xxsettings file or
DHCP Option 176 (SSON). If you use static programming, you cannot enable
SNMP as of Release 2.6.
To find more information about SNMP and MIBs, see the IETF references listed in
Documents on page 18. The Avaya Custom MIB for the 4600 Series IP Telephones is available
for download in *.txt format on the Avaya support Web site. This Custom MIB is common to both
H.323 and SIP IP telephones. Objects that are not relevant to a given telephone have Null data.

Network Assessment

The current technology allows optimum network configurations to deliver VoIP with perceived
voice quality close to that of the Public Switched Telephone Network (PSTN). Not all networks
can take advantage of packet voice transmissions. Some data networks have insufficient
residual capacity for even compressed voice traffic. In addition, the usual approach to
developing data networks by integrating products from many vendors requires testing the
components for Voice over IP traffic compatibility.
32 4600 Series IP Telephone LAN Administrator Guide
Chapter 4: Server Administration,
Parameters.
Table 10: 4600 Series IP
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